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x in (-oo:+oo)
x/(-9) = 9-1 // - 9-1
x/(-9)-9+1 = 0
-1/9*x-8 = 0 // + 8
-1/9*x = 8 // : -1/9
x = 8/(-1/9)
x = -72
x = -72
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